make+sure+or+certain
131making — make make, v. t. [imp. & p. p. {made} (m[=a]d); p. pr. & vb. n. {making}.] [OE. maken, makien, AS. macian; akin to OS. mak?n, OFries. makia, D. maken, G. machen, OHG. mahh?n to join, fit, prepare, make, Dan. mage. Cf. {Match} an equal.] 1. To… …
132nail down — make certain, make sure I am trying to nail down the exact time that he will be able to meet with us …
