रहम कीजिए।

• रहम = mercy
• कीजिए = a polite/respectful imperative of करना (to do)

So the literal structure is something like Do mercy, but the natural English meaning is Have mercy or Please show mercy.

Hindi often uses a noun + करना construction where English might use a simple verb.

So:

• रहम = mercy
• रहम करना = to show mercy / have mercy

This is very common in Hindi. Similar patterns are:

• मदद करना = to help
• कोशिश करना = to try / make an effort
• सवाल करना = to question / ask

So रहम कीजिए is built from रहम करना.

The verb करना is a little irregular, and in polite imperative forms Hindi very often uses कीजिए.

So both of these can be heard:

• रहम कीजिए
• रहम करिए

But कीजिए is very common and sounds standard and natural.

You will see this same pattern in other polite commands:

• कीजिए = please do
• लीजिए = please take
• दीजिए = please give

It is polite/respectful because of कीजिए.

Very roughly:

• रहम कर = very blunt / intimate / often not appropriate
• रहम करो = less formal, used with tum
• रहम कीजिए = polite/respectful, used with aap

So if you are speaking respectfully, कीजिए is the safe choice.

Yes, people understand it easily, but it often sounds strong, emotional, or dramatic.

It is commonly used when someone is:

• begging for kindness
• pleading
• speaking emotionally
• joking in an exaggerated way

For example, someone might say it seriously in a dramatic situation, or humorously in daily life:

• होमवर्क पर रहम कीजिए। = Have mercy about the homework.

So the phrase is normal, but it carries more emotional force than a neutral everyday request.

Yes. Hindi often uses पर for this.

Examples:

• मुझ पर रहम कीजिए। = Have mercy on me.
• हम पर रहम कीजिए। = Have mercy on us.
• उस पर रहम कीजिए। = Have mercy on him/her.

In रहम कीजिए।, the person affected is simply left unstated because the context already makes it clear.

A simple pronunciation guide is:

• रहम ≈ ra-ham or ruh-hum
• कीजिए ≈ kee-jee-ye

Put together:

ra-ham kee-jee-ye

A few notes:

• रहम has two syllables in Hindi: र-हम
• की is a long ee sound
• जिए is pronounced something like jee-ye

It is fully understandable in Hindi, but it has a somewhat Urdu/Persian-Arabic flavor in register and style.

A more Sanskrit-derived Hindi word with a similar meaning is दया.

So you may also see:

• दया कीजिए।

Both are understandable, but रहम can sound a bit more emotional, literary, or Urdu-leaning depending on context.

Yes, in many situations it does.

Because कीजिए is a polite imperative, it already gives the sentence a respectful please feeling. That is why रहम कीजिए। naturally means Please have mercy.

You can add कृपया in very formal or written style:

• कृपया रहम कीजिए।

But in normal speech, कृपया is usually unnecessary here.