(1) If the ox falls, whet your knife. 

(2) The black ox has trod on his foot. 

(3) The ox when weariest treads surest. 

(4) You cannot flay the same ox twice. 

(5) The ox is never woe, till he to the harrow go. 

(6) An ox is taken by the horns, and the man by the tongue. 

(7) The black ox has trod on her foot.

(8) He drove the ox hard.

(9) An old ox makes a straight furrow.

(10) An ox is a castrated bull.

(11) She brought the vegetables in an ox cart.

(12) He is as strong as an ox.

(13) An ox cart rattled along the stony road.

(14) Can you tell an ox from a cow?

(15) Chicago Ox team equalized two minutes before the end of the match.

(16) The Ox doesn't seem to have any chance of winning the league basketball matches.

(17) The ox kills well.

(18) I'm willing to be an ox serving the country all my life.

(19) Patients used to arrive by ox cart.

(20) Eventually the straw-stuffed ox was weathered into small pieces.

(21) We depended on that ox not only for transportation but also for sustenance.

(22) It consists of an ox rib about six inches long[sentencedict.com], with what looks like a pair of curved parallel lines.

(23) A lamb is as dear to a poor man as an ox to the rich. 

(24) Better is a dinner of herbs where love is, than a stalled ox and hatred therewith. 

(25) He that will steal an egg will steal an ox. 

(26) I'm very hungry, and I can now stow away an ox.

(27) Seize a horse by the mane, and lead an ox by the nose.

(28) The guilty man was to be drawn on an ox hide to the gallows, where he was hanged.

(29) Whether this phenomenon is good or bad for democracy depends on whose ox is being gored.

(30) The grill had mutton chops and mash; the buffet ran things like smoked salmon, potted shrimps and corned ox tongue.