Dbundle command bundle same key value D-records into one record. See the manual Dbundle for the detail.

The command argument key-field-list:

word:f

gives key fields of "bundling" operation. This example means:

• if the "word" field value (folded in upper case) is same as the previous record,
• other fields (in this case "chapter" field) are appended to the previous record.

For the detail of the key-field-list, see the manual Dintro.