steam(sth)up
—phrasal verbwithsteamverbuk/stiːm/us/stiːm/
Ifglassor something with aglassorsimilarsurfacesteamsup, itbecomescoveredwith athinlayerofwatercausedbysteamtouchingit, and if yousteamit up, youcausethis tohappen.
（使）蒙上水汽
Thebathroommirrorsteamedup during myshower.我淋浴的时候，浴室的镜子蒙上了水汽。
Going into thewarmroomsteamedmyglassesup.走进暖和的房间，我的眼镜蒙上了一层水雾。