Cases of word usage

1) a curved stick of wood, which returns to the thrower if it does not hit anything (boomerang)

2) to polish (metal) as if by rubbing (burnish)

3) a quick blow as if with a chopper (chop)

4) (an example of) the condition when events happen at the same time as if this had been arranged (coincidence)

5) (to make) a soft, murmuring sound as if of doves (coo)

6) (to use) a method to test if (a calculation, process etc) is accurate by doing it a different way (crosscheck)

7) to ask for (something) as if ordering or as if one has a right to (demand)

8) (of a person) feeling as if everything is turning round, as if unable to balance; mentally confused (dizzy)

9) to make (something) seem larger, better, worse etc than if really is (exaggerate)

10) (of machinery) able to be in a safe state if it stops working (failsafe)