what is the meaning of the phrase 'Hold water'?

Which pair of words is synonymous?(MAT:20-21)

Antonym of "Laud"(M.20-21)

Synonym of " Unwavering"(M.20-21)

Antonym of "Bizarre"(M.20-21)

Synonym of "Ability" are all of the followings except (M.19-20)

Antonym of " Refractory " is(M.19-20)

Antonym of "Well mannered" (M.18-19)

Antonym of "revenge"(M.18-19)

Synonym of "Exhausted"(M.18-19)

"Pragmatic"(M.18-19)

Antonym of "Smart "(M.17-18

Antonym for "Modern"is (M.17-18)

Synonym for " Courteous" (M.17-18)

Antonym of " combination "(M.16-17)

Synonym of " Legendary "(M.16-17)

Synonym of " Synergy" (M.16-17)

Antonym of " Facilitate " (M.15-16)