Sis forStoop (posture)
Strumming is a way of playing a stringed musical instrument, particularly a guitar. You strum a guitar by moving your fingers or a pick across the strings. You usually strum a guitar in a kind of rhythm.
Swimming is a way of moving when you are in the water, using your arms and legs to push you fowards. There are many different ways of swimming, with names like breaststroke, freestyle, butterfly and the one that most children start with - dog paddle!
You can use the word swim as a noun, as in "I am going for a swim".
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You tickle someone by poking them or running something like your fingers or a feather over their skin. Tickling feels funny and makes you laugh and squirm.
It is almost impossible to tickle yourself. Children tend to be much more ticklish than adults. People are usually ticklish under their feet and on their ribs.