DINK

I. noun Etymology: by shortening & alteration Date: 1903 dinghy , II. noun Etymology: ~ to hit with a drop shot, probably of imitative origin Date: 1939 drop shot , III. noun Etymology: perhaps from ~, disparaging name for a Vietnamese Date: 1974 nitwit , jerk , nerd , IV. noun Usage: often all capitalized Etymology: double income, no kids Date: 1986 a couple with two incomes and no children