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| English | Russian |
| his muscles toughened | его мышцы напряглись |
| toughen muscles | напрягать мышцы |
| toughen position on the issue | ужесточить свою позицию по этому вопросу |
| toughen the requirements | ужесточать требования (к; for Nosy) |
| toughen up | давать закалку |
| toughen up | вести себя мужественно (Tourists are too soft. A no go area, give me a break. Just because people are running around with machetes, lying comatose on the sidewalk, shooting up on street corners and breaking into vehicles, doesn't make it a no go area. People need to toughen up.  vancouversun.com ART Vancouver) |
| toughen up | закалиться (eu21) |
| toughened by a lifetime of battling with the elements | закалённый в постоянной борьбе со стихиями |