1 grave

2 serious

3 severe

4 critical

1 to congregate

2 to assemble

3 to mass

4 to gather together

5 to amass

6 to polymerize

1 party

2 gathering

3 to meet

4 to get together

1 to repeat

2 repetition

3 again

4 re-

5 classifier: layer

1 again

2 once more

3 re-

1 each word carries weight

2 a promise must be kept (idiom)

1 destiny will make enemies meet (idiom)

2 (often said about lovers who have a disagreement)

1 lit. not knowing what's important (idiom); no appreciation of the gravity of things

2 naive

3 doesn't know who's who

4 no sense of priorities

1 high merit and worthy prospects (idiom)

1 goose feather sent from afar, a slight present but weighty meaning (idiom); It's not the present the counts, it's the thought behind it.