You may want to set up and configure a bonded link between your Meraki MS series switch and a Cisco switch. This is often referred to as link aggregation, link bonding or EtherChannel.
In order to configure 2 or more ports (up to 8) to be a port aggregate, simply navigate to Configure >> Switch ports and select the target ports, then choose "Aggregate Ports". It is recommended that you do not have the target ports physically connected to anything during this step.
On your Cisco switch, you must enable LACP by setting the EtherChannel mode to active or passive depending on the behavior you desire. For further information, please see Cisco's documentation on Configuring EtherChannel (this document is for the Catalyst 3000 series).