reserve
vb
1 conserve, hang on to, hoard, hold, husband, keep, keep back, lay up, preserve, put by, retain, save, set aside, stockpile, store, withhold
2 bespeak, book, engage, prearrange, pre-engage, retain, secure
3 defer, delay, keep back, postpone, put off, withhold
n
4 backlog, cache, capital, fall-back, fund, hoard, reservoir, savings, stock, stockpile, store, supply
5 park, preserve, reservation, sanctuary, tract
6 aloofness, constraint, coolness, formality, modesty, reluctance, reservation, restraint, reticence, secretiveness, shyness, silence, taciturnity
adj
7 alternate, auxiliary, extra, fall-back, secondary, spare, substitute