1. (noun) a settled and monotonous routine that is hard to escape

• groove

2. (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity

• estrus
• heat
• oestrus

3. (verb) hollow out in the form of a furrow or groove

• furrow
• groove

1. (noun) a groove or furrow (especially one in soft earth caused by wheels)

• channel
• groove

2. (noun) a settled and monotonous routine that is hard to escape

• modus operandi
• routine

3. (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity

• physical condition
• physiological condition
• physiological state

4. (verb) be in a state of sexual excitement; of male mammals

• be

5. (verb) hollow out in the form of a furrow or groove

• cut into
• delve
• dig
• turn over

1. (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity

• anestrum
• anestrus
• anoestrum
• anoestrus

1. (noun) a groove or furrow (especially one in soft earth caused by wheels)

• furrow
• groove
• rutted
• rutty

2. (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity

• estrous

3. (verb) be in a state of sexual excitement; of male mammals

• estrus
• heat
• oestrus

4. (verb) hollow out in the form of a furrow or groove

• channel
• groove
• furrow
• groove
• vallecula