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1. (photography) used of film that is coated on the side opposite the emulsion with a substance to absorb light
    
2. Having a back or backing, usually of a specified type

1. Pick one person to give support and approval to in a particular role
   "I backed Kennedy in 1960";
   - endorse, indorse, plump for, plunk for, support
    
2. Travel backward
   "back into the driveway"; "The car backed up and hit the tree"
    
3. Give support or one's approval to
   "I can't back this plan";
   - second, endorse, indorse
    
4. Cause to travel backward
   "back the car into the parking spot"
    
5. Support financial backing for
   "back this enterprise"
    
6. Be in back of
   "My garage backs their yard"
    
7. Gamble on something
   "Which horse are you backing?";
   - bet on, gage [archaic], stake, game, punt
    
8. Shift to a counterclockwise direction
   "the wind backed"
    
9. Establish as valid or genuine
   "Can you back up your claims?";
   - back up
    
10. Strengthen by providing with a back or backing

See also: back out, back up, coated, hardback, hardbacked, hardbound, hardcover [N. Amer], high-backed, low-backed, razorback, razor-backed, spiny-backed, stiff-backed, straight-backed

Type of: affirm, approve, back up, bet, change over, confirm, corroborate, finance, go, greenlight, green-light, lie, locomote, move, O.K., OK, okay, play, sanction, shift, strengthen, substantiate, support, sustain, switch, toughen, travel, wager

Antonym: backless, bring forward, face, veer

Encyclopedia: Back, Manitoba