My Dwarf player writes wondrously evocative dialogue, but of late has run short of ideas when it comes to spouting oaths. Stuff like "Durin's Beard!" and "Maker!" and (privately) "Mahal!" are obviously top-notch choices, but what other oaths might Dwarves use? I know a lot of old English oaths consisted of such minor blasphemies as "God's blood!" (shortened to "Bloody") and "God's wounds!" (shortened to "Zounds!") and "God's teeth!". I want to have a list of similarly colorful phrases she can use in her posts, but with a suitably authentic Tolkien feel. "Stone and steel!" is one that comes to mind.

Oath? I guess you mean curses.

"Baruk Khazad!" (Axes of the Dwarves) is a battle cry that is used in dwarvish and one of the most used one. Could perhaps used as a curse.

Some expressions that can be used
"By all the silver/mithrill in the mountain - that is the most stupid thing I ever heard"
"Dragons hoard, that is a treasure!"
"By my golden heart, I will stay true to my word"
"Taste like elfwine" Something that taste weird
"Like elfoath" A empty promise, or empty gesture
"By Mahals maker" (Mahal is dwarves name of Aule, the creator)

Some curses on indivual
"Orcspawn" (reference that dwarves are no found of orcs)
"Oathbreaker" alternative "Oathbane"
"Goldwaister" for someone that are not good at something (waisting resources)
"Mahals wrath upon you"

Good topic!

One of the (few?) quotes from Jackson's/Rhys-Davies' Gimli that doesn't bring dwarves into comedy foil disrepute is the unforgettable, "You have my axe." (Actually: "And my axe," wevs.)
So "By my axe!" would effortlessly evoke that.

Dwarves are very strong on their (paternal) bloodlines, so "father", "fathers", or even more alliteratively and flavourfully "forefathers" are all good references to bring in when making a beard(s) or axe(s) exclamation.

Dwarves have all that big deal about names -- especially original Khuzdul names (and curses can be done indirectly as "curse his name" instead of just "curse him"). So the less reverent about it, or those more stressed in the heat of the moment, might utter a "Names of my grandfathers!"

They like to be buried in stone, with only a grim 'consolation' pride to be had from being a Burned Dwarf. So where the real world has "Damn me!", might the Dwarves have "Burn me!"?

They like their oaths and their word of honour (viz. Gimli's quote with Elrond re "sworn word", on leaving Rivendell). So they might say "My word!", or "Upon my word," and really mean a lot by it, even if it sounds a bit quaint and understated to our modern sensibilities. Would "By my troth," be too far?

Sorry this is a bit unformed. I may be able to come back and do better. But I hope it gives people the seeds of some ideas. And say hi to Bes from a fan!

Cheers,
--Os.

Goblin Dung
Elf gold and goblin silver (virtually worthless)
By Azog's skull
Ten thousand thundering trolls (for the Haddock inspired dwarf)
May the mountain fall on my head

"By the Seven Fathers."

"A curse on your line."

"Feckless Smooth Chin."

"Whiskerless fool."

"I'll cut you down to my size."

"You reek like a drakeling breaking wind."

"May my beard fall out if I'm not right."

"On my word I will not parley with Oathbreakers."

Osric mentioned linking "Fathers" and beards and axes. Add blood, stone, mines and holds (home/real estate) and similar references to the mix and match scheme as well.

References to Mothers and/or the use of a female name (common or khuzdul version) might be an irreverent bit of foolishness, an epithet, rather than an explicit curse (ie, "By my mother's beard, who ever taught a dwarf to dance?". "Ah, she can assay the gold in a coin with naught but a bite!" (hmm.. is that last one a compliment or a curse?)

Also, I wanted to add that some of these might be relevant only to certain clans of the dwarves. For instance, Durin's line is the Longbeards. There are also the Firebeards - which one guesses are probably redheads. So a Redbeard calling a Longbeard "whitebeard" might be equivalent to being called unmanly (err, undwarfly? anyway... colorless, or lacking color to your beard, which for a Redbeard implies physical immaturity), but might go unremarked because to a Longbeard the cultural reference doesn't translate / isn't known. Heck it might be considered respectful, as in they're old and wise. (Yes it is a bit unlikely, but I think you get the idea.)

Liquor capacity might also be an issue as dwarves are a tad bit fond of ale.

Curses referencing Azog would probably be considered either a mortal insult or the basis of a family feud (perhaps confirmation of one). So something like...

Dwarf1: You would question my skill? Having crafted the finest of blades?
Dwarf2: Finest? Hah! That sword is only Azog's pig-sticker!
Dwarf1: /pulls out axe and swings without further talk or warning.