nail down

complete, close, make a final summary

Verb
1. succeed in obtaining a position; "He nailed down a spot at Harvard"
(synonym) nail, peg
(hypernym) succeed, win, come through, bring home the bacon, deliver the goods
2. define clearly; "I cannot narrow down the rules for this game"
(synonym) pin down, peg down, narrow down, narrow, specify
(hypernym) determine
(hyponym) concretize
3. make final; put the last touches on; put into final form; "let's finalize the proposal"
(synonym) finalize, finalise, settle
(hypernym) end, terminate

get a clear answer, find out, pin down I've checked the books, but I can't nail down the reason for the loss. I can't find the error.

Synonyms and related words:
afford proof of, ascertain, assure, balance, ballast, bring home to, certify, cinch, clear up, clinch, counterbalance, decide, demonstrate, determine, dismiss all doubt, ensure, establish, find out, firm, firm up, fix, follow, follow from, freeze, get at, have a case, hold, hold good, hold water, immobilize, insure, keep, make certain, make good, make no doubt, make no mistake, make out, make sure, make sure of, pin down, prove, prove to be, prove true, reassure, remove all doubt, retain, see that, see to it, set at rest, settle, settle the matter, show, sort out, stabilitate, stabilize, steady, stick, transfix
  

phrv. ตอกตะปูลง (syn. peg down, pin down); บังคับให้ (ตัดสินใจ, ตั้งใจ, กระทำ ฯลฯ) เด็ดขาด (syn. peg down, pin down, tie down to); มั่นใจเกี่ยวกับ