Cases of word usage

1) next (to a person, thing); near (to a person, thing) but not necessarily touching (adjacent)

2) (of ships) touching the bottom in shallow water (aground)

3) (an instance of) the Christian ceremony of touching a person with, or putting a person in, water, to show that he or she is accepted as a member of the church (baptism)

4) to make (something) dirty, impure or diseased (by touching or adding something impure) (contaminate)

5) the sensation characteristic of something when touching or being touched (feel)

6) a straight line touching a curve (tangent)

7) to excite the nerves of the skin by touching (a person) lightly, often to cause laughter; to have, feel, cause, an itching or tingling sensation (tickle)