Head  —n. 1 upper part of the human body, or foremost or upper part of an animal's body, containing the brain, mouth, and sense-organs. 2 a seat of intellect (use your head). B mental aptitude or tolerance (a good head for business; no head for heights). 3 thing like a head in form or position, esp.: a the operative part of a tool. B the top of a nail. C the leaves or flowers at the top of a stem. D foam on the top of a glass of beer etc. 4 a person in charge, esp. The principal teacher of a school. B position of command. 5 front part of a queue etc. 6 upper end of a table or bed etc. 7 top or highest part of a page, stairs, etc. 8 a individual person as a unit (£10 per head). B (pl. Same) individual animal as a unit (20 head). 9 a side of a coin bearing the image of a head. B (usu. In pl.) This as a choice when tossing a coin. 10 a source of a river etc. B end of a lake at which a river enters it. 11 height or length of a head as a measure. 12 part of a machine in contact with or very close to what is being worked on, esp.: a the part of a tape recorder that touches the moving tape and converts signals. B the part of a record-player that holds the playing cartridge and stylus. 13 (usu. In phr. Come to a head) climax, crisis. 14 a confined body of water or steam in an engine etc. B pressure exerted by this. 15 promontory (esp. In place-names) (beachy head). 16 heading or headline. 17 fully developed top of a boil etc. 18 colloq. Headache. 19 (attrib.) Chief, principal. —v. 1 be at the head or front of. 2 be in charge of. 3 provide with a head or heading. 4 (often foll. By for) face, move, or direct in a specified direction (is heading for trouble). 5 hit (a ball etc.) With the head.  above (or over) one's head beyond one's understanding. Come to a head reach a crisis. Get it into one's head (foll. By that) 1 adopt a mistaken idea. 2 form a definite plan. Give a person his (or her) head allow a person to act freely. Go to one's head 1 make one slightly drunk. 2 make one conceited. Head off 1 get ahead of so as to intercept and turn aside. 2 forestall. Keep (or lose) one's head remain (or fail to remain) calm. Off one's head slang crazy. Off the top of one's head colloq. Impromptu. On one's (or one's own) head as one's own responsibility. Out of one's head slang crazy. Over one's head 1 beyond one's understanding. 2 without one's rightful knowledge or involvement, esp. Of action taken by a subordinate consulting one's own superior. 3 with disregard for one's own (stronger) claim (was promoted over my head). Put heads together consult together. Take it into one's head (foll. By that + clause or to + infin.) Decide, esp. Impetuously. Turn a person's head make a person conceited. [old english]