1) to lay hold of
2) to take, capture
2a) of fishes
3) to apprehend
3a) of a man, in order to imprison him
Part of Speech: verb
Probably another form of G971; to squeeze, that is, seize (gently by the hand [press], or officially [arrest], or in hunting [capture]): - apprehend, catch, lay hand on, take. Compare G4085.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root πιάζω; click on the second column to search for that grammatical form of the root πιάζω; click on the third column to search for that word and grammatical form; click on the total to search for the root πιάζω.