英和和英

when the need arises

to show more than required

in case of necessity

according to the need

to provide against a possible need―provide against emergencies

to meet a need―meet a want

to meet a need

to be necessary

have as a necessary feature

according to the need―according to the urgency of the case

as much as necessary

the degree of necessity

You will be required to do so.

immediate needs

when occasion demands

of something, to be needed

to urge （on one） the necessity of something―impress upon one the importance of something

do the necessary

depending on the necessity

urgently needed

to be pressed by necessity

I will work if necessary―if need be.

to meet the demand―supply the demand

to supply the demand―meet the demand

to meet an emergency―meet the exigencies of the times

in any way necessary

by necessity

something that can be relied on when needed

to be provided with necessities

task to be done as needed