英和和英

to ask for a second help

have another [a second] helping

to substitute

a replacement

a substitution for something

the action of making someone act as a substitute for something

a person who substitutes

to allow a person to take the role of another

in lieu of

a substitute

appoint as a substitute

an alternative plan

Would you like another helping?

Bring another bottle!

to be substituted

to be able to do something on behalf of a person

to substitute something

substitute goods

the act of fulfilling another person's duty

Is it proper to ask for a second help?

Will you have another helping?

supply the place of…

Give me this instead.

to serve for―do duty for―something

recommend a substitute

a person whose shoulder is leant on by another person, rather than that person using a cane or crutch to lean on

I shall leave as soon as I find a successor.

I will protect you at the peril of my life.

One thing serves as a substitute for another―serves for another―does duty for another.

a thing used for a time instead of the next thing