1 to participate

2 to take part

3 to join

1 to participate (in sth)

1 to mature

2 to grow

3 growth

1 length

2 long

3 forever

4 always

5 constantly

1 to grow up

1 proficiency in a particular field (idiom)

2 skill in a specialized area (idiom)

1 You can't gain knowledge without practical experience (idiom); wisdom only comes with experience

1 to use one's position for personal gain (idiom)

1 the future is long (idiom); there will be ample time for that later

2 We'll cross that bridge when we get there

1 to put forward plans and ideas (also derogatory)

2 to give advice (idiom)