Let's pencil this in.

Meaning

Let's tentatively schedule this; it's not yet confirmed.

Examples

• John: Can we meet next Tuesday?
• Alice: Let me check my calendar. <b>Let's pencil this in</b> for now.
• John: Okay, great. I'll keep it free.
• Alice: Perfect. I'll confirm later today. For now, <b>let's pencil this in.</b>