Japanese phrase
遅くなるときは連絡します。 oso ku na ru to ki wa ren raku shi ma su
Meaning
I will let you know if I am running late.
When to use it
Promises to contact someone if arriving or returning late. It is a polite and reassuring way to explain what will happen if plans are delayed.
Example dialogue
何時ごろ帰りますか？ nan ji go ro kae ri ma su ka
What time will you be home?
遅くなるときは連絡します。 oso ku na ru to ki wa ren raku shi ma su
I will let you know if I am running late.