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thicken (v.)
[thicken 词源字典]
late 14c. (transitive), 1590s (intransitive), from
thick
+
-en
(1). Related:
Thickened
;
thickening
. An earlier verb was Middle English
thick
, Old English
þiccian
"to thicken, to crowd together."
[thicken etymology, thicken origin, 英语词源]