Definitions from Wiktionary ( )

▸ verb:  (transitive) To make thicker (in the sense of wider).
▸ verb:  (transitive) To make thicker (in the sense of more viscous).
▸ verb:  (intransitive) To become thicker (in the sense of wider).
▸ verb:  (intransitive) To become thicker (in the sense of more viscous).
▸ verb:  (transitive) To strengthen; to confirm.
▸ verb:  (transitive) To make more frequent.

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