In semi-simultaneous compounds the lexical constituents are originally combined sequentially. However, they change in their prosodic and phonological properties by remaining two-handed. In other words, they undergo reduction and/or assimilation. Because of that change in their prosodic or phonological properties, their stems cannot be identified as completely independent lexical items.
a) house^study (‘school’)
b) bars^close (‘to be in jail’)
Example (a) involves a movement reduction of the second constituent, study, which has a contact-movement repetition as an independent sign. Example (b) shows a case where the stems of the semi-simultaneous compound cannot be identified as completely meaningful lexical items.