Synonyms of thicken in English:

thicken


See definition of thicken

verb

1‘stir over a gentle heat until the mixture thickens’

SYNONYMS
become thick, become thicker, stiffen, become firmer
condense, become more concentrated
solidify, set, gel, congeal, clot, coagulate, cake
rare inspissate, gelatinize

2‘the plot thickened’

SYNONYMS
become more complicated, become more involved, become more intricate, become more mysterious, deepen