from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To make or become deep or deeper.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To make deep or deeper
- v. To make darker or more intense; to darken
- v. To make more poignant or affecting; to increase in degree
- v. To make lower in tone
- v. To become deeper
- v. To become darker or more intense
- v. To become lower in tone
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To make deep or deeper; to increase the depth of; to sink lower.
- transitive v. To make darker or more intense; to darken.
- transitive v. To make more poignant or affecting; to increase in degree.
- transitive v. To make more grave or low in tone.
- intransitive v. To become deeper
from The Century Dictionary and Cyclopedia
- To become deep or deeper, in any sense; increase in depth.
- To make deep or deeper, in any sense.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. make more intense, stronger, or more marked
- v. make deeper
- v. become more intense
- v. become deeper in tone
From deep + -en (Wiktionary)