1 hole

2 pit

3 tunnel

4 to defraud

1 concave or convex

2 bumps and holes

3 uneven (surface)

4 rugged

1 to cheat sb

1 depressed

2 sunken

3 indented

4 concave

5 female (connector etc)

1 cavity

2 convex opening

1 lit. every turnip to its hole (idiom)

2 fig. each person has his own position

3 each to his own

4 horses for courses

5 every kettle has its lid

1 (idiom) all over the place

2 in every nook and cranny

3 packed to the rafters

1 lit. to jump out of a fire pit (idiom); to escape from a living hell

2 to free oneself from a life of torture

1 out of the frying pan into the fire (idiom)

1 to dodge a pit only to fall into a well (idiom)

2 out of the frying pan into the fire