To become thicker
coagulate, curdle, petrify, ossify, solidify, freeze, clot, set, congeal, gel, grow thick; see also harden 2, stiffen 1.
Antonyms flow*, thaw, weaken.
To make thicker
reinforce, add, expand, enlarge, buttress, widen, swell; see also harden 1, stiffen 2.
Antonyms decrease*, narrow down, slice off.
To make thick or thicker, especially through evaporation or condensation:
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