Here is a list of idomatic expressions with arm.
Cost an arm and a leg
If something costs an arm and a leg, it is very expensive.
- That laptop costs an arm and a leg.
Keep someone or something at arm’s length
To keep someone at arm’s length is to avoid close contacts with them.
- He always keeps his neighbors at arm’s length.
With open arms
To receive someone with open arms is to receive them with great enthusiasm.
- The parents received their estranged son with open arms.
To account for something is to give a satisfactory explanation.
- Can you account for your absence from school?
Call someone to account
To call someone to account is to ask them to explain their poor performance.
- Rahul had been missing his deadlines so his boss called him to account.
On account of
On account of means ‘because of’
- They sacked him on account of his poor performance.
- There will be no edition of this newspaper on Monday on account of Holi.
On no account (= under no circumstances)
You must on no account post too much personal information on social media.
- You must not on any account reveal your real name.
Take account of
To take account of something is to take that into consideration.
- We must take account of his political affiliations before offering him this job.