1) to make something thoroughly clean (cleanse)

2) to question (a person) thoroughly or formally (interrogate)

3) to search (a place) untidily and thoroughly (ransack)

4) a kind of gun with a long barrel, (to be) fired from the shoulder; to search (something) thoroughly in order to steal (rifle)

5) to make a person, thing thoroughly wet; soak; to fill (a market, need etc) completely; to cause (one substance) to absorb the greatest possible amount of another (saturate)

6) (to cause a person, thing) to move; to move a spoon etc round and round in (liquid etc) in order to mix it thoroughly (stir)