check off vs qualify

check off

verb
  • To carry out a decision recorded through the process of checking off an item on a list, including dealing with it, removing it from the possible choices, or removing the not checked items from further consideration. 

  • To mark items on a list (with a checkmark or by crossing them out) that have been chosen for keeping or removal or that have been dealt with (for example, completed or verified as correct or satisfactory); to tick off (UK), tick (UK), cross off, strike off. 

  • To deduct union members' dues from their wages. 

qualify

verb
  • To modify, limit, restrict or moderate something; especially to add conditions or requirements for an assertion to be true. 

  • To certify or license someone for something. 

  • To throw and catch each object at least twice. 

  • To compete successfully in some stage of a competition and become eligible for the next stage. 

  • To make someone, or to become competent or eligible for some position or task. 

  • To give individual quality to; to modulate; to vary; to regulate. 

  • To describe or characterize something by listing its qualities. 

noun
  • An instance of throwing and catching each prop at least twice. 

How often have the words check off and qualify occurred in a corpus of books? (source: Google Ngram Viewer )