WHOLE CHARACTER
收shōu
to receive; to accept; to put away; to store; to harvest; to gather in; to stop; to bring to an end
收 is taking things in: 收到 'to receive', 收获 'harvest', 收割 'to reap', and putting things away — 收拾 'to tidy up'.
ZDIC detailed source: 形声,从攴( pū)、丩( jiū)声 — the action hand with the old sound piece 丩; the original sense was to seize.
LEFT: THE OLD SOUND PIECE 丩 (JIŪ)
丩jiū
to entwine (archaic graph)
An archaic graph (jiū); when a character keeps it as a piece, the role is stated on that character's page.
In 收: left: the old sound piece 丩 (jiū) A historical sound side: shōu has no modern sound relation with jiū — the initial, final and tone all differ.
RIGHT: THE ACTION-HAND SIDE (FROM 攴)
攵pū
the tap/strike hand (from 攴)
The action-hand radical in many characters; not a standalone modern word. Each page shows its role in that character.
In 收: right: the action-hand side (from 攴) The tap/act hand; a bound radical form.