Source : Webster's Revised Unabridged Dictionary (1913)

Boost \Boost\ (b[=oo]st), v. t. [imp. & p. p. {Boosted}; p. pr.
   & vb. n. {Boosting}.] [Cf. {Boast}, v. i.]
   To lift or push from behind (one who is endeavoring to
   climb); to push up; hence, to assist in overcoming obstacles,
   or in making advancement. [Colloq. U. S.]

Boost \Boost\ (b[=oo]st), n.
   A push from behind, as to one who is endeavoring to climb;
   help. [Colloq. U. S.]

Source : WordNet®

boost
     v 1: increase; "The landlord hiked up the rents" [syn: {hike}, {hike
          up}]
     2: give a boost to; be beneficial to; "The tax cut will boost
        the economy"
     3: contribute to the progress or growth of; "I am promoting the
        use of computers in the classroom" [syn: {promote}, {advance},
         {further}, {encourage}]
     4: increase or raise; "boost the voltage in an electrical
        circuit" [syn: {advance}, {supercharge}]
     5: push or shove upward, as if from below or behind; "The
        singer had to be boosted onto the stage by a special
        contraption"

boost
     n 1: the act of giving hope or support to someone [syn: {encouragement}]
     2: an increase in cost; "they asked for a 10% rise in rates"
        [syn: {rise}, {hike}, {cost increase}]
     3: the act of giving an upward push; "he gave her a boost over
        the fence"