困った時はお互い様の英語

We should help each other in times of need.

Let us stand by each other in time of need!

Let us stand by each other in the day of trouble―in time of need.

When you need a friend, come to me!

when you run into trouble

the moment something is encountered

when it comes to the point

the act of accomplishing one thing in the course of doing another thing

the circumstances at the time something is encountered

Time has no mercy

the quality of being timely

You can come when [if] you please.

having a disagreeable experience and not wishing to repeat it

I'll get it done in a moment―in a second―in a minute―in a twinkling―in the twinkling of an eye―in no time―in less than no time.

to be apt to do something

the time period during which something prospers

matters that occurred in the past

You will soon laugh on the wrong side of your month―laugh out of the other corner of your month.

To use a common expression―in common parlance.

Please lend it me if you have done with it.

occurring in spells and often abruptly

What if you should fall ill?

I'll come if nothing interferes.

Scatter to the mountain gale

when the humor takes me

for a moment

if it is all the same (to you)

Time glides on―glides by―slides away―slips by―slips along.

when the fit is on him

an emergency measure implemented at a time of trouble