give way vs sag

give way

verb
  • To collapse or break under physical stresses. 

  • To begin rowing. 

  • To yield to persistent persuasion. 

  • To be followed, succeeded, or replaced by. 

  • To give precedence to other road users. 

  • To allow another person to intervene to make a point or ask a question whilst one is delivering a speech. 

  • To allow the expression of (a pent-up emotion, grief, etc.). 

sag

verb
  • To lose firmness, elasticity, vigor, or a thriving state; to sink; to droop; to flag; to bend; to yield, as the mind or spirits, under the pressure of care, trouble, doubt, or the like; to be unsettled or unbalanced. 

  • To cause to bend or give way; to load. 

  • To wear one's trousers so that their top is well below the waist. 

  • To pull down someone else's pants. 

  • To loiter in walking; to idle along; to drag or droop heavily. 

  • To sink, in the middle, by its weight or under applied pressure, below a horizontal line or plane. 

  • To lean, give way, or settle from a vertical position. 

noun
  • The state of sinking or bending; a droop. 

  • The difference in height or depth between the vertex and the rim of a curved surface, specifically used for optical elements such as a mirror or lens. 

  • The difference in elevation of a wire, cable, chain or rope suspended between two consecutive points. 

How often have the words give way and sag occurred in a corpus of books? (source: Google Ngram Viewer )