take the weight off your feet/legs idiom
（长时间站立或行走后）坐下歇歇脚，坐下喘口气
If you take the weight off your feet/legs, you sit down, especially after standing or walking for a long time.
You must be exhausted after all that shopping - sit down and take the weight off your feet! 逛了那么长时间的街你一定累坏了——坐下歇歇脚吧！