Possible Clues:

• Accidentally discover what's said to be nearer me
• Accidentally learn about present declaration
• Use your ears to get what's being said on this side, by the sound of it
• Tune in to conversation accidentally
• Manage to catch some cricket and try
• Listen without speaker's knowledge
• Catch unintentionally
• Catch bird interrupting deliveries
• Catch (words exchanged between others)
• Like GIs in WW2, it's said — and what the buggers do!