to move your hand, or sth such as a cloth, backwards and forwards over a surface while pressing firmly 擦；磨；搓
~ sth
She rubbed her chin thoughtfully.
她若有所思地抚摩着下巴。
~ sth/yourself with sth
Rub the surface with sandpaper before painting.
用砂纸打磨表面，然后再上油漆。
~ sth/yourself against sth
The cat rubbed itself against my legs.
猫在我腿上蹭来蹭去。
~ at sth
I rubbed at the stain on the cloth.
我擦了擦布上的污渍。
~ against sth
Animals had been rubbing against the trees.
动物一直在这些树上蹭来蹭去。
~ sth/yourself + adj.
Rub the surface smooth.
将表面擦光。