• take aback
• answer back
• back to back
• behind one's back
• behind someone's back
• brush back
• cast your mind back
• come back
• cut back
• date back
• double back
• draw back
• drop back
• fade back
• fall back
• flanker back
• from way back
• get off one's back
• give the shirt off one's back
• hark back
• hold back
• in the back
• keep back
• kick back
• like water off a duck's back
• look back
• monkey on one's back
• off a duck's back
• off one's back
• on one's back
• on the back
• out back
• pat on the back
• piggy back
• pin one's ears back
• scratch one's back
• set back
• sit back
• stab in the back
• straw that breaks the camel's back
• straw that broke the camel's back
• take back
• taken back
• turn the clock back
• water off a duck's back
• while back
• world on one's back
• in the black
• jet black
• pot call the kettle black
• pot calling the kettle black
• tough nut to crack
• every man jack
• ahead of the pack
• get the sack
• give the sack
• hit the sack
• leave holding the sack
• the sack
• blow one's stack
• blow your stack
• change tack
• go sit on a tack
• sharp as a tack
• beaten track
• get the inside track
• inside track
• jump the track
• keep track
• lose track
• off the beaten track
• on the wrong track
• throw off the track
• out of whack

• take to task
• to task

• get the ax
• give the ax
• brass tacks
• across the tracks
• cover up one's tracks
• follow in one's tracks
• in one's tracks
• make tracks
• other side of the tracks
• right side of the tracks
• side of the tracks
• stop in one's tracks
• the tracks
• wrong side of the tracks
• on the wane and on the wax
• whole ball of wax

One-syllable words do not have mosaic rhymes.