Answer:

mating

Answer	Crossword Clue
MATING	Pairing
MATING	Uniting in marriage
MATING	Checking conclusively, in chess

MATING	Endgame aim
MATING	Endgame action
MATING	"The ... Game" (1959 Tony Randall movie)
MATING	Checking out?
MATING	Pairing.
MATING	Matching.
MATING	"The ... Game."
MATING	Kind of call

MATING	Action in a chess match
MATING	"The ... Season," 1927 play
MATING	Subject of some animal kingdom rituals
MATING	Winning chess matches
MATING	Type of ritual
MATING	Kind of call or season
MATING	Beating at chess