To do someone's bidding; to serve someone's interests.
To ask for; to solicit; to beseech.
To try to acquire or gain; to strive after; to aim at.
To try to find; to look for; to search for.
To try to reach or come to; to go to; to resort to.
To navigate through a stream.
To attempt, endeavour, try
The operation of navigating through a stream.