transitive. To make tough.
| 单词 | θ73402 | 
| 释义 | the world > matter > constitution of matter > strength > make strong or tough			[verb (transitive)]		 (4)		 toughen1703 transitive. To make tough. ruggedize1947 transitive. To make rugged or robust; to produce in a version designed to withstand rough usage. Subcategories:— 			make unyielding			(1)		 — 			support strain, wear, etc.			(1)		 | 
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