Stitching involves placing rebar of some sort across the interface between the elements concerned and concreting around it.

From my notes:
Couture - Stitching [CW,24.11.93, p12; CEi,10/96p29, nCE,22.8.96,p17, CEi 11/96p32]; connecting reinforcement (between floor plate, beam, etc. and topping)

But rather than dig up these ink-on-paper references (Construction Weekly, Construction Engineer International, New Civil Engineer), here are some electronic ones:

Crack stitching is a concrete crack repair method wherein fragmented walls and bricks are mended and reinforced. A number of rebar stitching materials are fitted and grouted in between crevices to re-join and seal bricks together. This process is done in order to get rid of gaps, making the masonry more stable and resistant to further cracking.
https://remedial.com.au/blogs/structural-repairs-a-look-into...

In situ concrete stitching with subsequent prestressing is often used in construction to join together precast concrete segments
https://hub.hku.hk/bitstream/10722/216783/1/content.pdf

There are three types of stitching used; cross-stitching, slot-stitching, and U-bar stitching. Cross-stitching is the most widely used method.
In cross-stitching, holes are drilled at an angle so that they intersect the longitudinal cracks or joints at about mid-depth of the slab.
https://pavementinteractive.org/reference-desk/maintenance-a...

Outside this area, in the midspan regions, discontinuous precast concrete planks and an in-situ stitch pour running along the main girders’ and diaphragms’ bottom flanges were provided (Figure 3).
https://learninglegacy.hs2.org.uk/document/benefits-of-steel...


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Note added at 3 hrs (2024-07-10 00:39:01 GMT)
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Nous conseillons de réaliser des coutures entre le poteau et le mur afin de maintenir le poteau.
We advise stitching the column to the wall to hold it in place.