1.
kitchen sink
The sink area in a kitchen, including the basin and the surrounding counter space used for washing dishes and food preparation.
2.
cruising (for customers)
A taxi driving around without a passenger, looking to pick someone up. Also used for street musicians or performers who move from place to place.
Derived from the verb 流す (to let flow). For sense 1, the word originally referred to the drain channel in traditional Japanese kitchens. In modern usage, 台所の流し specifically means the kitchen sink. The more technical term is 流し台 (sink unit/counter). For sense 2, 流しのタクシー is the standard phrase for a taxi looking for fares on the street, as opposed to one waiting at a taxi stand (駅前のタクシー乗り場).