Verify the squared pattern (5)
I believe the answer is:
check
This could be a double definition.
'verify' is the first definition.
(I know that check is a more specific form of the action the verify)
'squared pattern' is the second definition.
'check' can be an answer for 'pattern' (I've seen this before). I'm not sure about the 'squared' bit.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for check that I've seen before include "Investigate; stop" , "Suppress" , "Verify; restrain" , "retard!" , "Investigate; rein in" .)