1 barf (U.S. slang) belch, blow lunch (U.S. slang) chuck (up) (slang, chiefly U.S.) chunder (slang, chiefly Austral.) discharge, do a technicolour yawn (slang) eject, empty, expel, lose one's lunch (U.S. slang) regurgitate, spew, spit up, spout, throw up, toss one's cookies (U.S. slang) upchuck (U.S. slang) vomit
2 cede, give up, relinquish, renounce, resign, surrender, yield