Intensive extended sitting (usually one week starting each day at 4 or 5 a.m. and going until 9 p.m.) (literally, embracing or [directly] touching the mind).

Intensive meditation retreat of between two and seven days' duration, conducted in silence, where participants engage in a highly-structured and refined schedule of sitting, chanting, teisho, dokusan, work, meals and rest. Sesshin provides an environment in which the student may go deeper into the mind than is normally possible in everyday life.

an intensive meditation retreat which includes zazen, oryoki meals, services, mindful work and lectures

an intensive period of Zen Buddhist meditation

an intensive zen retreat and pretty much silent so we can't even talk on the phone

a silent zazen retreat, a chance to sink more deeply into Zen practice

To touch, receive, and convey the mind. An intensive Zen retreat of two to seven days.

Literally to inspect the heart-mind, a period of intense practice, typically approximately a week.

(Japanese) To touch, receive, or convey the mind; the Zen retreat, conventionally seven days.

a Zen retreat

days of especially intense, strict practice

Meditation retreats, generally lasting one week.

Intense long-duration practice session.

A sesshin (攝心) is a period of intensive meditation (zazen) in a Zen monastery.