drop-in

Adjective

not-comparable of a place or facility

Japanese Meaning

短期間利用に適した / 既存のシステムのインフラを変更せずに、複雑なシステム内の一部の要素の代替として使用可能な

We offer drop-in tutoring sessions for students who need help on short notice.

急に助けが必要な学生のために、臨時の個別指導セッションを提供しています。

Sense（1）

Provided for short-term use.

Sense（2）

(manufacturing) Fit to substitute for some element in a complex system without changes to the existing infrastructure.

We need the ultimate drop-in biofuel to make use of our expensive oil-based infrastructure.

Sense（3）

(of a place or facility) Allowing people to drop in; that is, to visit casually, without an appointment.

a drop-in centre