allowance vs forget it

allowance

noun
  • Permission; granting, conceding, or admitting 

  • A permissible deviation in the fineness and weight of coins, owing to the difficulty in securing exact conformity to the standard prescribed by law. 

  • A planned deviation between an exact dimension and a nominal or theoretical dimension. 

  • Acknowledgment. 

  • A child's allowance; pocket money. 

  • Abatement; deduction; the taking into account of mitigating circumstances 

  • An amount, portion, or share that is allotted or granted; a sum granted as a reimbursement, a bounty, or as appropriate for any purpose 

  • A permitted reduction in the weight that a racehorse must carry. 

  • A customary deduction from the gross weight of goods, differing by country. 

verb
  • To put upon a fixed allowance (especially of provisions and drink). 

  • To supply in a fixed and limited quantity. 

forget it

verb
  • Don't let it bother you; put it out of your mind. 

  • I don't want to continue with this conversation (usually used in frustration or anger). 

  • It doesn't matter. 

  • A conventional reply to an expression of gratitude. 

  • Absolutely not; I forbid it or it is impossible. 

How often have the words allowance and forget it occurred in a corpus of books? (source: Google Ngram Viewer )